A new way of letting the reader make a commitment so he will be more inclined to read and pay attention.
A web page (sales letter) that – when first visiting – looks like a jigsaw puzzle. The viewer has to complete the puzzle (it should be very easy) and only then it becomes a regular web page.
For fun and to develop your mind.
A book about the general techniques, methods and theories for solving different kinds of puzzles. Should be comprehensive, teach the underlying methods and how they work and not just give solutions to specific examples of puzzles.
Build a game around each chapter of the book. For instance, after reading the first chapter, the reader has to realize what is the most important word, sentence, concept, etc. in that chapter. He then has to communicate this (website, email, SMS, etc.) to you. If he is correct, he gets a bonus (an extra short story about the main character, a badge, a tip, etc.) If he is not correct or a bit off he’ll get some help to arrive at the right answer. Each chapter has a different game, and if they make it to the last one, they get a big bonus.
The objective is not to make it hard, but fun and rewarding, so they are motivated to continue and maybe also spread the word about it.